Cal RIpken is adopting the 2018 USA Baseball bat standard. Valpo Americans will follow suit and require all bats used in league play and in post season tournaments to carry the 2018 USA Baseball Logo. Manufacturers began introducing these bats in September 2017, so if your player's bat is older than that it will not pass. Below is a link to the new bat rules on the official Cal Ripken website and a link to all approved bats listed by manufacturer (you'll have to copy and paste).